Question

The hydrogen bonding in water creates ________, a cohesive force that enables one to slightly overfill a glass with water or allows denser objects, such as a lengthwise steel needle, to float on water.
A) capillary action
B) friction
C) surface tension
D) heat exchange

Answer 1

Answer:

C) surface tension

Explanation:

Surface tension is the stretching force on a liquid's surface film caused by bulk liquid particles attracting themselves in the surface layer, which minimises surface area of the liquid.

The surface tension water is high as the strong hydrogen bonds of the on the surface

pull the water molecules together. As such a water drop will tend to occupy the smallest area on the surface.

Water surface tension is 72 dynes/cm at 25°C . That means 72 dynes of force is required to break a water surface film of 1 cm long. Water surface tension varies inversely with temperature. Surface tension of water is as a result of water molecule's polar nature of the and hydrogen bonding.